A tragic accident happens to someone you care about dearly. A stranger responds to that accident and tends to that person helping the best they can. They contact you to notify you of the incident. You realize that their actions were clearly something that prevented something way worse from happening.
You begin to form a friendship with that person, thinking that this person is a Godsend, liking them more and more as you get to know each other.
Until you find out that this person was involved something terribly awful. So awful that you know otherwise you would NEVER EVER associate with this person. But in the meantime, if you never found out, you would still be forming a closeness with this person.
How would you react, what would your thinking be?